eisenhart



(No Model.)

2 Sheets-Sheet 1. O. A. EISENHART.

ELECTRICAL APPARATUS FOR DENTAL OPERATIONS.

Patented Nov. 24, 18851 IIIILHEI, E iliuml u b v Imm (No Model.) 2 SheetsSheet 2. O. A. EISENHART.

BLEGTRICA-L APPARATUS FOR DENTAL OPERATIONS.

Patented Nov. 24, 1885.

1.7V VEJV TOR 4L Attorney WITNESSES o0 dW. A

UNITED STATES PATENT OFFI E.

CHARLES A. EISENHART, or YORK, PENNSYLVANIA.

ELECTRICAL APPARATUS FOR DENTAL OPERATIONS.

SPECIFICATION forming part of Letters Patent N0. 331,121, dated November 24:, 1885.

Application filed February 10, 1885. Serial No. 155,506. (No model.)

To call whom it may concern:

Be it known that 1, CHARLES A. EISEN- HART, a citizen of the United States, residing at York, in the county of York and State of Pennsylvania, have invented a certain new and useful Improved Electrical Apparatus for Dental Operations, of which the following is a full, clear, and exact description.

This invention relates to the class of apparatus shown in my application for patent, Se rial No. 147,686, filed November 11, 1884; and it consists in means for operating an inductioncoil in connection with the dischargers, by which the current is applied to the person under treatment, as I will now proceed to particularly describe and claim.

In the accompanying drawings, in the sev-- eral figures of which like parts are similarly designated, Figure 1 is an elevation of my apparatus without the dischargers; Fig. 2, a top plan view of the same on line a: 00, Fig. 1. Fig. 3 is an elevation of a modification. Fig. 4 is a side view of one of the dischargers, and Fig. 5 a cross-section of the same on line 3 y.

In order to render my apparatus easily portable and at the same time get it within a small compass, I employ a box, a, containing, say, two cells (preferably Leclanches) and an induction coil, 0, of any approved construction, suitably connected. From the coil conductors d d lead to the dischargers, such as shown in Figs. 4 and 5, or those shown in my application referred to. The core 0 of the induction-coil is operated by a lever, f, loose- 3 5 jointed thereto, and pivoted, say at g, in hangers from the top of the box, which lever is actuated by a hand-piece, h, connected therewith and extending up out of the box, or by a pedal, 6, connected with a rod, j, depending from the lever. The hand-piece and pedal are detachably connected with the lever, so as to be placed in the box when it is to be moved from place to place or packed away. The elements of the cell or cells (one or more of which may be used) are connected to contactmakers k l, which in this instance are pieces of wire arranged crosswise of and one above another beneath the short end of the lever f, and it will be seen that the depression of the lever f wipes the wire Z across and in contact with the wire 70 and makes the circuit in con- I nection with the dischargers. By arranging the contacts in this way, so that they will wipe or move across each other, their contactsurfaces are always kept bright and clean, and hence the certainty of their action insured; and I esteem this an essential feature of my invention, since it is specially useful where the metal is subject to oxidation or fouling in damp places.

In Fig. 3 I have shown a form of my apparatus in which the cells are omitted and may be placed in a cellar or elsewhere, and connected to the induction-coil in suitable man ner; and I have substituted for the lever of Figs. 1 and 2 a bell-crank lever, the lower portion of the short end of which is curved, as at f, to act in conjunction with the contactwires It Z, and this curvature of the lever will still further increase the wiping action of one wire upon the other. The long end of the le ver is slotted at f to permit the rise and fall of the core as said lever is moved on its pivot.

It is obvious that the contact-wires might be crossed under the pedal and be operated by it where that form of operating mechanism alone is used. Instead of the hand-piece shown in my application referred to, I may omit from it the metal straps and have simply a concave plate, to be applied to the arm of a chair in any suitable manner; but the hand-piece, or, technically, the disoharger, I prefer is composed of a metal or other electricity-conducting tube, m, Figs. 4 and 5, provided with posts at, whereby it maybe secured to the top, side, or bottom of the arms of a dental or other chair or support, and having its ends closed by detachable caps 0, of a more or less ornamental character. Owing to the hardening of the skin of the hands, and their consequent lack of susceptibility to electric influence, I prefer to provide a number of holes, 1), in the tube on, and fill said tube with wet sponge or other water-absorbent, which will project through said holes, and coming in contact with the hands moisten and thereby soften them sufficiently to render them susceptible to the current. Electric connection is made with magnetized, and thus the electric current is, as it were, centered or focused at that particular tooth and seat of nerves, and consequently the pain neutralized to a greater extent by the thus centering of a sort of counter-irritating electricity.

The invention herein is a perfecting of the details in connection with the broad invention of the application hereinbefore referred to.

It is obvious that the patient can be more or less electrified by the operators entire control of the induction-coil.

What I claim is 1. The combination,with an induction-coil, alever loosely connected to its core, and means to operate said lever, of contact-makers crossing each other and operated by the fall and rise of said lever to make and break a circuit in connection with a suitable source of electricity, and dischargers and conductors connecting them with the induction-coil, substantially as described.

2. The combination, with the case, cells, induction-coils, and crossed contacts connected in circuit with suitable dischargers and a lever, of hand and foot pieces operating in conjunction with the crossed contacts tomake and break the circuit, substantially as described.

3. In an electric apparatus for dental use, the tubular discharger provided with holes and containing a moistened substance, substantially as described.

4:. An induction-coil anda leverloosely con nected to its core, combined with a battery, dischargers, and conductors connecting the battery, lever, and coil, and means to operate said lever to regulate the strength of the current in accordance with the requirements of the operator, substantially as described.

5. The combination, with the case, cells, induction-coils,and crossed contacts connected in circuit with suitable dischargers, and a lever, of a footpiece operating in conjunction with the crossed contacts to make and break the circuit, substantially as described.

In testimony whereof I have hereunto set my hand this 6th day of February, A. D. 1885.

CHARLES A. EISENHART.

Witnesses:

J AMES PELL, GEORGE B. Knnnnn. 

